Inflation is USA's weakest point, considering the extreme debt situation for both US companies and federal and local governments, and the urgent need for permanently low interest rates because of this.

Iran could respons asymmetrically by an all-out attack on Saudi-Arabia's oil production and tankers in the region. And depending on the composition of the CPI (Core Price Index), the production of other products could be attacked too, in order to increase the CPI and force FED to increase interest rates.

That will most likely cause an enormous economic crisis. High inflation is the only situation the FED cannot be solved by pouring more money on the problem.